EP0186536B1 - Apparat zum Entfernen von Schlamm für eine Reinigungseinrichtung von einer Dampferzeugerrohrplatte und Dampferzeuger mit solchem Apparat - Google Patents

Apparat zum Entfernen von Schlamm für eine Reinigungseinrichtung von einer Dampferzeugerrohrplatte und Dampferzeuger mit solchem Apparat Download PDF

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Publication number
EP0186536B1
EP0186536B1 EP85402193A EP85402193A EP0186536B1 EP 0186536 B1 EP0186536 B1 EP 0186536B1 EP 85402193 A EP85402193 A EP 85402193A EP 85402193 A EP85402193 A EP 85402193A EP 0186536 B1 EP0186536 B1 EP 0186536B1
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EP
European Patent Office
Prior art keywords
steam generator
enclosure
tubes
plate
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85402193A
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English (en)
French (fr)
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EP0186536A1 (de
Inventor
Bernard Lebouc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Original Assignee
Framatome SA
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Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0186536A1 publication Critical patent/EP0186536A1/de
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Publication of EP0186536B1 publication Critical patent/EP0186536B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators

Definitions

  • the present invention relates to sludge removal devices for installation for cleaning the steam generator tubular plate comprising, in a cylindrical enclosure closed by the plate, a bundle of parallel tubes connected to the plate, traversed by a primary fluid to high temperature, devices of the type comprising at least one insertable liquid supply and sludge suction assembly.
  • the invention relates more particularly to the removal devices making it possible to organize, on the plate, a circulation of cleaning liquid by injection of a cleaning liquid, generally water, at the periphery of the plate and under almost incidence grazing and by suction of the water which collects at the periphery of the plate.
  • a cleaning liquid generally water
  • the installation generally comprises, in addition to the device, at least one lance which can be moved radially between two adjacent plies of tubes, parallel to and near the tubular plate, the lance having a terminal part provided with nozzles directing oblique jets towards the tube plate.
  • the document FR-A-2,352,269 describes for example a device which comprises two assemblies which are inserted into the enclosure through a closable hole in the latter. Each assembly consists of two symmetrically and tangentially directed inlet nozzles and two outlet nozzles. Two circumferential flows are thus produced in a semicircle at the periphery of the tube plate.
  • this device has significant drawbacks.
  • the nozzles are introduced through the envelope through the same hole as a lance or lances for attacking deposits on the plate.
  • the assembly therefore represents a space requirement such that it can only be inserted through a hole of large diameter.
  • the present invention aims in particular to provide a device for eliminating sludge for installations for cleaning tubular plates which respond better than those previously known to the requirements of practice, in particular in that it is of simple structure and easy to put in place, and guarantees a good sweeping of the sludges suspended by attack lances of the layer of mud which has gradually formed and hardened during the operation of the generator.
  • the invention provides a device of the type defined above, in accordance with the characterizing part of claim 1.
  • the pipe can be maintained in the pipe, in its current part, by perforated centralizers distributed along the pipe.
  • the pipe is advantageously provided with a tight fixing flange on the access hole provided in the envelope.
  • a pipe having a rigid end portion and whose permanent curvature is sufficiently high so that this end portion can be engaged through an eye hole until it comes in close proximity to the tube plate, without it abutting against the exchange tubes placed at the periphery of the bundle.
  • the thickness of the envelope, the free distance between the beam and the envelope and / or the dimension of the access hole will be such that it will be necessary to constitute the terminal section of the pipe by a flexible. This can have the high radius of curvature required for the introduction, then flex so as to ensure good contact between the outlet of the pipe and the plate at the end of insertion of the pipe. In practice, this flexible section may consist of a bellows.
  • the invention is applicable whatever the mesh of the distribution network of the exchange tube in the bundle.
  • the device is adaptable to an exchanger whose tubes are distributed in a square network and it can then in particular cooperate with slurry attack lances of the kind described in the document FR-A-2,514,108 already mentioned.
  • the device can also be used in a heat exchanger where the tubes are distributed in a triangular network. In this case, it will advantageously be associated with a lance or spears for attacking the sludge in the three directions of the mesh of the network.
  • the steam generator shown in FIG. 1 comprises a pressure enclosure of cylindrical shape 1 closed at its lower part by a tubular plate 2 in which are terminated and welded the end parts of U-shaped heat exchange tubes, such as tube 7
  • the enclosure is extended, under the plate 2, by a dome delimiting a water box 3, separated by a vertical partition 4 into a compartment where the hot primary water coming from the reactor arrives by a pipe and an outlet compartment d '' where the primary water escapes to the reactor through a tube 6. Between the two compartments the primary water circulates in the U-shaped tubes.
  • a secondary envelope 8 Between the bundle of U-shaped tubes 7 and the enclosure 1 is placed a secondary envelope 8.
  • the secondary envelope 8 ends above the tubular plate, leaving a space allowing the secondary water and the water. of recirculation which descend through the annular space between the enclosure and the envelope to supply the area occupied by the beam, immediately above the tube plate.
  • a distribution plate 11 comprising a central opening 12 is disposed above the tubular plate 2.
  • the hot and cold branches of the tubes 7 are separated by a free diametrical zone 13, called “water street where spacers 14 are placed and a continuous purge ramp 15.
  • the enclosure 1 shown has two relatively large diameter holes 17 called “fist holes” located opposite the “water street” and at the level of the distribution plate 11. Two smaller holes, usually called “ eye “, are aligned in a direction perpendicular to that of the" fist holes "at a short distance from the tube plate 2. Often, two" eye holes “1 6 are also provided below the" fist holes ".
  • the enclosure 1 is surrounded by a casemate (not shown) whose role is in particular to stop the parts and projected debris in the event of an incident.
  • an installation is generally used having on the one hand means for attacking the layer of mud, comprising at least one lance insertable into the enclosure, and on the other share a removal device.
  • the latter comprises several organs insertable into the enclosure through the "eye holes” or the "fist holes”.
  • the insertable assembly shown in Figures 2 to 4 is intended to be introduced into the enclosure 1 through an "eye hole" 16 located 90 ° from the water street.
  • This assembly 18 consists of a suction pipe 20 provided with a flange 22 intended to be applied in a sealed manner on the enclosure, around the "eye hole", in replacement of the shutter tape.
  • the rear part of this pipe is provided with a. suction connection 24 intended to be connected via a hose 26 to a suction pump (not shown).
  • the end portion 28 of the pipe 20 insertable into the enclosure has a shape such that at the same time it can be introduced without jamming against the bore of the "eye hole” or coming into abutment against the exchange tubes and, when it is in place, it bears against the tubular plate 2.
  • the end of the pipe 20 is advantageously swollen and provided with terminal fingers 30 such that the outlet of the pipe is slightly immersed in the layer of water which will cover the peripheral part of the plate during operation.
  • the assembly 18 also comprises means for circulating the water on the plate, comprising a rigid pipe 32 held coaxially with the pipe by perforated centralizers not shown.
  • the rear part piping 32 protrudes from the pipe and is provided with a nozzle 34 for connection to a hose for supplying water under high pressure (300 bars for example).
  • the downstream end of the piping 32 opens into a nozzle or water spray head 36 which may have the constitution shown in FIG. 3.
  • This nozzle is provided with a nozzle 38 for forming a jet directed approximately perpendicularly to the nozzle, in the circumferential direction of the enclosure.
  • the jet emitted must be under grazing incidence. In practice an angle of about 80 * on the vertical will generally be appropriate.
  • FIGS. 2 to 4 two sets of the type shown in FIGS. 2 to 4 will be inserted by “opposite eye holes in the enclosure, the nozzles being oriented so as to cooperate in order to organize a circumferential circulation in the same direction over the entire periphery of the plaque.
  • Figures 7 and 8 show an installation comprising a device for removing sludge with two assemblies 18 connected to a hydraulic system which can be carried by a vehicle so as to be transportable as a block from one steam generator to another.
  • FIG. 7 shows the use of two lances introduced by “eye holes” 16 placed in the water street. Each of these lances is movable along its axis by a servo motor assembly 42 fixed on a “hole in the eye” flange. Each of these servo motors is controlled, from the system, in synchronism with the water supply to the lances, so that there is a sequence of sending jets in each of the ligaments (intertubular spaces) of the tube bundle 7.
  • the lances can have one of the constitutions described in the patent applications already mentioned. They can be composed of a head and tubular sections connectable to each other, quick assembly and disassembly. Several succession heads can be used, comprising jets for sending water jets with increasingly small impact angles, way to sweep the entire tubular plate.
  • FIG. 8 shows, for example, the case where shots are fired at angles ranging from 25 'to 85 "in succession.
  • the installation can be completed by additional suction pipes introduced through these holes. It is not necessary to describe here the operation of the installation which is carried out according to a cycle similar to that of which a description is given in the document FR-A-2,514,108 already mentioned.
  • FIG. 6 shows an assembly constituting yet another embodiment, usable when the curvature which it is necessary to give to the nozzle 28 to avoid interfering with the bundle of tubes is incompatible with the coming of the outlet bearing on the tubular plate .
  • the end portion of the pipe 28 is no longer constituted by a rigid tube, but by a deformable bellows 44.
  • This bellows is connected by welding to a nozzle 46 screwed into the terminal bulge of the pipe, bulge which is crossed by the nozzle 36.
  • the bellows has the outline indicated in solid lines in FIG. 6, it makes it possible to introduce the pipe into the enclosure 1.
  • This bellows can take the form indicated in dashes to come to be supported by fingers 30 of an end crown on the plate 2.
  • the use of a compressible bellows has the additional advantage of making it possible to use the same assembly for steam generators having variable distances between “hole "and” tube plate ".
  • FIGs 7 and 8 The installation shown in Figures 7 and 8 is intended to be implemented in a steam generator where the tubes are distributed in a square or at least rectangular network. However, the invention is also applicable to the case of a generator where the tubes are distributed along a triangular mesh.
  • Figure 9 shows very schematically the relative arrangement of some tubes 7 in this case.
  • the lance introduced by the water street 13 must then direct jets in the three directions indicated by arrows. For this it suffices to have a lance comprising nozzles directed in the appropriate directions.
  • FIG. 10A-10D and 11 show how this type of sludge attack can be achieved by an appropriate arrangement of the nozzles 46-52, only the axes of which are shown in Figures 10A to 10D.
  • FIG. 11 also shows an assembly 18 introduced by an “eye hole” 16.
  • Four assemblies of this kind can be introduced through the enclosure 1. It is also possible to provide only two complete assemblies 18 comprising a projection nozzle d water, the other two assemblies ensuring only suction. We can even provide only the suction by counting on the jets projected by the lances 40 to ensure the sweeping.
  • Figure 12 shows a sludge removal device for a triangular mesh beam generator, of a type having a preheater which divides the base of the abutment into two half-beams (top and bottom of the figure ) separated by a central partition 56 and a skirt 54.
  • the device comprises two lances 40 of the type shown in FIG. 11, introduced by two opposite fist holes 17.
  • Each of these assemblies 18 (only one of which is shown) is associated with an assembly 58 which ensures only the suction of water loaded with mud.
  • Two double nozzles 60 introduced through eye holes, 90 'from the lances, open into the space between the enclosure 1 and the skirt 2 and make it possible to inject water under high pressure for cleaning this space. . The water thus introduced is taken up by the assemblies 18 and 58.
  • the general constitution of the spears may be one of those described above.
  • a hole allowing high-pressure water to escape upwards will be provided to balance the forces exerted on the lance.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Sewage (AREA)
  • Treatment Of Sludge (AREA)

Claims (11)

1. Vorrichtung zum Entfernen von Schlamm für eine Reinigungseinrichtung einer Dampferzeugerrohrplatte (2) mit einem in einem durch die Platte geschlossenen Zylinder (1) angeordneten Bündel paralleler Rohre (7), die mit der Platte verbunden und von einem ersten Fluid durchströmt sind, wobei die Vorrichtung wenigstens eine einführbare Einheit (18) zur Zuführung von Flüssigkeit und zum Ansaugen von Schlamm aufweist, dadurch gekennzeichnet, daß die Einheit ein Ansaugrohr (20) mit einem gekrümmten Bereich und einer im Inneren des Rohrs angeordneten Leitung (32) aufweist, die mit einer Reinigkeitsflüssigkeitszuführung verbindbar und von einer Düse (36) zum Ausstoß der Flüssigkeit in eine zum gekrümmten Bereich des Rohres senkrechte Richtung begrenzt ist, wobei die Flugbahn im Verhältnis zur Horizontalen flach ist, und daß die Düse von einem Ausstoßkopf begrenzt ist, der die Seitenwand des Rohres durchdringt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Leitung in ihrem beweglichen Bereich von mit Öffnungen versehenen, entlang der Leitung verteilten Zentrierungen gehalten ist.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Rohr von einem verformbaren Abschnitt (44) begrenzt ist.
4. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Rohr von Stützzapfen begrenzt ist.
5. Dampferzeuger mit einer abnehmbaren Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Raum des Dampferzeugers von einer Öffnung (16, 17) durchdrungen ist, die in der Nähe der rohrförmigen Platte angeordnet ist, daß der gekrümmte Bereich eine solche Form aufweist, daß er in die äußere Umhüllung durch die öffnung einführbar ist, unterhalb einmündet und dann in unmittelbarer Nähe der Platte zwischen dem Raum und dem Rohrbündel endet, und daß die Düse derart ausgerichtet ist, daß die Flüssigkeit in Umfangsrichtung des Raumes ausgestoßen wird.
6. Dampferzeuger nach Anspruch 5, dadurch gekennzeichnet, daß er mehrere Spritzrohre zum Austreten von Reinigungsflüssigkeit aufweist, die durch rechtwinklig zur Durchtrittsöffnung der einführbaren Einheit (18) angeordnete Öffnungen in den Raum einführbar sind, wobei die Spritzrohre mit Düsen mit fester Orientierung zur Richtung von schrägen Strahlen auf die ringförmige Platte und mit Einrichtungen versehen sind, die es erlauben, diese radial im Verhältnis zum Raum zu verschieben, wobei ihre Wasserzuführung unterbrochen ist, wenn sich die Spritzrohre gegenüber den Rohren befinden.
7. Dampferzeuger nach Anspruch 6 mit U-förmigen Rohren, die von dem ersten Fluid durchströmt werden und einen Wasserweg (13) entsprechend dem Durchmesser des Raumes begrenzen, dadurch gekennzeichnet, daß die Spritzrohre dazu bestimmt sind, in Beobachtungsöffnungen, entlang des Wasserweges eingeführt zu werden, während zwei Einheiten dazu bestimmt sind, jeweils in eine Beobachtungsöffnung eingeführt zu werden, die um 90' gegenüber dem Wasserweg versetzt angeordnet ist.
8. Dampferzeuger nach Anspruch 7 mit entlang eines regelmäßigen dreieckförmigen Maschennetzes verteilten Rohren, dadurch gekennzeichnet, daß jedes Spritzrohr vorgesehen ist, Strahlen in drei Richtungen zu lenken, von denen eine rechtwinklig zum Wasserweg und die beiden anderen im Winkel von 60' zum ersten angeordnet sind.
9. Dampferzeuger nach Anspruch 8, dadurch gekennzeichnet, daß jedes Spritzrohr für jede seiner drei Richtungen mehrere Einspritzdüsen (46-52) aufweist, die eine Orientierung gegenüber der Horizontalen aufweisen, die derart ist, daß ein zentraler Bereich der Platte Strahlen aus allen drei Richtungen erhält, ein Bereich der Platte entlang des Wasserweges Strahlen lediglich aus einer Richtung rechtwinklig zum Wasserweg erhält, und daß die übrigen Bereiche Strahlen rechtwinklig zum Wasserweg und nur in einer Richtung mit 60" gegenüber dem letzten erhalten.
10. Dampferzeuger nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß er einführbare Einheiten ohne Wassereinspritzrohre aufweist.
11. Dampferzeuger nach einem der Ansprüche 6 bis 10 mit einer transversalen Seitenwand im unteren Bereich und mit einem Mantel (54), der mit dem Raum (1) einen ringförmigen Raum begrenzt, dadurch gekennzeichnet, daß er mit zwei Einheiten (18) zum Ansaugen und Einspritzen, die das Innere des Mantels durchdringen und diametral entgegengesetzt und in der Nähe der Seitenwand (56) angeordnet sind, mit zwei Einheiten (58) zum Ansaugen, die etwa gegenüber den Räumen zum Ansaugen und Einspritzen in unmittelbarer Nähe der Zwischenwand angeordnet sind, und mit zwei Düsen (60) zur Zuführung. von Reinigungsflüssigkeit versehen ist, welche jeweils an einer Seite der Seitenwand angeordnet sind und in den ringförmigen Zwischenraum etwa im Bereich des Zwischenraums zwischen der Einheit (18) zum Ansaugen und Einspritzen und der Einheit (58) zum Ansaugen einmünden, wobei der Zwischenraum an derselben Seite der Seitenwand angeordnet ist.
EP85402193A 1984-11-13 1985-11-13 Apparat zum Entfernen von Schlamm für eine Reinigungseinrichtung von einer Dampferzeugerrohrplatte und Dampferzeuger mit solchem Apparat Expired - Lifetime EP0186536B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417289A FR2573179B1 (fr) 1984-11-13 1984-11-13 Dispositif d'enlevement des boues pour installation de nettoyage de la plaque tubulaire d'un generateur de vapeur et installation comportant un tel dispositif
FR8417289 1984-11-13

Publications (2)

Publication Number Publication Date
EP0186536A1 EP0186536A1 (de) 1986-07-02
EP0186536B1 true EP0186536B1 (de) 1990-01-03

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EP85402193A Expired - Lifetime EP0186536B1 (de) 1984-11-13 1985-11-13 Apparat zum Entfernen von Schlamm für eine Reinigungseinrichtung von einer Dampferzeugerrohrplatte und Dampferzeuger mit solchem Apparat

Country Status (9)

Country Link
US (1) US4653435A (de)
EP (1) EP0186536B1 (de)
JP (1) JPS61180807A (de)
KR (1) KR860004272A (de)
CA (1) CA1237349A (de)
DE (1) DE3575193D1 (de)
FR (1) FR2573179B1 (de)
YU (1) YU45991B (de)
ZA (1) ZA858482B (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0265549B1 (de) * 1986-10-30 1991-06-05 Anco Engineers Inc. Druckpulsierendes Reinigungsverfahren für einen Rohrbündelwärmetauscher
FR2558747B1 (fr) * 1984-01-27 1986-07-25 Innus Ind Nuclear Service Procede de nettoyage sous haute pression d'un evaporateur et installation utilisee dans ce but
US4848278A (en) * 1985-11-26 1989-07-18 Apex Technologies, Inc. Nuclear steam generator sludge lancing method and apparatus
BE905193A (nl) * 1986-07-29 1986-11-17 Smetjet N V Inrichting voor het met een waterstraal reinigen van een stoomgenerator.
JPS63270453A (ja) * 1987-04-24 1988-11-08 Hitachi Chem Co Ltd 窒化アルミニウム基板の金属化法
JPS646536U (de) * 1987-07-01 1989-01-13
EP0315870B1 (de) * 1987-11-11 1990-09-12 Siemens Aktiengesellschaft Dampferzeuger
US4972804A (en) * 1989-04-25 1990-11-27 Alexander T. Kindling Method and apparatus for organizing the flow of fluid in a vertical steam generator
FR2858683B1 (fr) * 2003-08-07 2005-11-04 Framatome Anp Echangeur de chaleur et en particulier generateur de vapeur a fond convexe
DE102010039413B4 (de) * 2010-08-17 2012-03-29 Areva Np Gmbh Verfahren und Vorrichtung zur Entnahme einer Probe aus einem Dampferzeuger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661124A (en) * 1970-06-19 1972-05-09 Foster Wheeler Corp Apparatus and process for slag deposit removal
DE2262151A1 (de) * 1972-12-19 1974-07-04 Siemens Ag Dampferzeuger, insbesondere fuer druckwasserreaktoren
FR2514108B1 (fr) * 1981-10-06 1986-06-13 Framatome Sa Procede et dispositif d'elimination des boues sur la plaque tubulaire des generateurs de vapeur
EP0084867B1 (de) * 1982-01-25 1985-06-19 Kraftwerk Union Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruck-Abschlämmen von Wärmetauschern
US4526135A (en) * 1984-02-03 1985-07-02 Westinghouse Electric Corp. Eddy current workpiece positioning apparatus

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Publication number Publication date
CA1237349A (en) 1988-05-31
FR2573179A1 (fr) 1986-05-16
US4653435A (en) 1987-03-31
YU45991B (sh) 1992-12-21
DE3575193D1 (de) 1990-02-08
ZA858482B (en) 1986-06-25
EP0186536A1 (de) 1986-07-02
FR2573179B1 (fr) 1987-02-13
KR860004272A (ko) 1986-06-20
JPS61180807A (ja) 1986-08-13
YU176685A (en) 1989-02-28

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